Dr Mike faces one of his toughest cases yet when Aristotle, a Terrier mix , arrives at DogTown with a disfiguring, undiagnosed skin condition thats left the dog nearly hairless, with raw skin covered in scabs. Dr Mike works overtime to find the cause of the painful problem and help heal the dog. Behavior Consultant Sherry Woodard heads out on an urgent rescue to save the lives of eight beagles. But while most of the pint-sized pups are healthy and highly adoptable, one of the Beagles, Electra, has heartworm- a costly and potentially fatal condition. No one knows how far the disease has progressed. An advanced case could be hard to treat meaning a home may be a long way off. As a result of living life in a small indoor run with no human attention, an aggressive chow mix named Waylon, lashes out unpredictably when faced with new situations. Trainer Pat Whitacre must help Waylon overcome his willingness to bite.